Protects documents, drawings and artwork. Tough plastic tube with screw-on end cap expands from 24-1/2″ to 40″ long. Locking tabs in 3/4″ increments. Adjustable shoulder strap. Clear plastic end cap contains indentification label. 3-1/2″ diameter. The black screw cap seals the tube. The clear cap on the opposite end is for labeling purposes. A label goes under the clear cap and the cap snaps on the end of the black lid.